A flexible adjustable fixture for fatigue performance testing of arc-shaped plate specimens

Abstract

The present invention relates to the field of mechanical experimental equipment, and discloses a flexible adjustable fixture for fatigue performance testing of an arc-shaped plate specimen, which includes a fixture body, a horizontal guide rail, a slider, a positioning bolt, a clamping table, a support plate, a long bolt, a wedge block, and bolts and nuts for fastening, etc. The fixture body is composed of a horizontal base and two side support wall plates. Lateral threaded holes are provided on the two side support wall plates of the fixture body, and the long bolts are installed in the lateral threaded holes. A horizontal guide rail is provided on the horizontal base of the fixture body, and a slider is arranged on the horizontal guide rail. A through hole is provided in the middle of the slider, and the positioning bolt is installed in the through hole and can move up and down. The clamping table is fixedly connected with the positioning bolt, and a wedge block and a support plate are arranged on the clamping table. Compared with the prior art, the present invention has a simple structure and good flexibility, can clamp specimens with different curvatures and different thicknesses, and can inhibit the change of the curvature of the specimen when it is stressed.

Description

Technical Field

[0001] The present invention relates to the field of mechanical experimental equipment, and particularly to a flexible adjustable fixture for fatigue performance testing of arc-shaped plate specimens. Background Art

[0002] A fatigue testing machine is a mechanical property testing instrument used in the field of mechanics. It adopts a microcomputer-controlled all-digital wide-frequency electro-hydraulic servo valve to drive a precision hydraulic cylinder. The microcomputer control system performs automatic control of test force, displacement, and deformation in multiple modes to complete tensile, compressive, bending, fatigue, and fracture performance tests on various specimens.

[0003] Fixtures are widely used in the processes of machining and assembly. Usually, work fixtures can only clamp standard workpieces, and they often fall short when it comes to clamping non-standard workpieces, and new fixtures need to be designed according to the shape and processing requirements of the actual workpiece. In the current field of work fixtures, fixtures for arc-shaped plate specimens with different curvatures still have problems such as inaccurate positioning, unstable clamping, and inconvenient operation.

[0004] At present, there is no unified standard for fixtures for arc-shaped plate specimens, and there are deficiencies such as a small applicable range, poor positioning accuracy, lack of flexibility, and low clamping efficiency. Therefore, how to improve the positioning accuracy of arc-shaped plate specimens with different curvatures, achieve stable clamping, and be easy to operate has become a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In order to solve the above deficiencies, the purpose of the present invention is to provide a flexible adjustable fixture for fatigue performance testing of arc-shaped plate specimens, which has the advantages of simple and convenient clamping, high clamping efficiency, and accurate and reliable positioning.

[0006] The present invention is realized through the following technical solutions: A flexible adjustable fixture for fatigue performance testing of arc-shaped plate specimens, characterized in that the fixture part includes a fixture body, a horizontal guide rail, a slider, a positioning bolt, a clamping table, a support plate, a long bolt, a lateral threaded hole, a wedge block, and bolts and nuts for fastening, etc. The fixture body is composed of a horizontal base and two side support wall plates. A number of lateral threaded holes are provided on the two side support wall plates of the fixture body. The long bolt is installed in the lateral threaded hole. A horizontal guide rail is provided on the horizontal base of the fixture body. A slider is provided on the horizontal guide rail. A through hole is opened in the middle of the slider. The positioning bolt is installed in the through hole and can move up and down. The clamping table is fixedly connected to the positioning bolt. A wedge block and a support plate are provided on the clamping table.

[0007] Preferably, one end of the long bolt is spherical.

[0008] Preferably, the number of the horizontal guide rails is two, and the horizontal guide rails are symmetric about the horizontal base.

[0009] Preferably, a slider is arranged on the horizontal guide rail. The slider is a cube slider, and the width of the slider is the same as the width of the horizontal guide rail.

[0010] Preferably, threaded holes are symmetrically arranged around the slider. Bolts and nuts are screwed into the threaded holes to fasten the slider on the horizontal guide rail.

[0011] Preferably, a through hole is arranged at the center of the slider, and the diameter of the through hole is slightly larger than the diameter of the positioning bolt.

[0012] Preferably, the positioning bolt and the clamping table are connected together by bolts. After the positions of the positioning bolt and the clamping table are determined, they are fastened with double nuts.

[0013] Preferably, a groove is arranged on the clamping table. The wedge block is installed in the groove, and the wedge block is fixed on the clamping table with an anti-dropping spring. The number of the wedge blocks is two, and the position between the two wedge blocks is a clamping cavity.

[0014] Preferably, threaded holes are arranged on the bottom surface of the clamping table. The support plate is installed on the bottom surface of the clamping table. Bolts matching the threaded holes are arranged on the support plate, and the support plate is fastened on the clamping table with nuts.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. It can be applied to arc plate specimens with different curvatures. When clamping the specimen, first fasten the fixture body at one end of the clamping device of the material testing machine, then connect the clamping table and the positioning bolt on the slider with bolts, and then move and rotate the position of the clamping table to align the clamping cavity between the two wedge blocks in the clamping table with one end of the arc plate specimen. Then turn the bolt on the support plate to make the support plate drive the wedge block to move upward together until the wedge block can no longer move upward and stop, and fasten the support plate on the clamping device with double nuts. At this time, the wedge block clamps one end of the specimen. Then move the slider on the horizontal guide rail and rotate the clamping table to a suitable position to align the other end of the arc plate specimen with the clamping device of the material testing machine. At this time, fasten the slider, the positioning bolt and the clamping table at the current position by tightening the mating nuts between all parts. Because the slider, the positioning bolt and the clamping table of this fixture are all movable, for arc plate specimens with different curvatures, through the appropriate movement and rotation of the slider, the positioning bolt and the clamping table, the wedge block on the clamping table can always clamp the arc plate specimen. Therefore, it has a certain versatility.

[0017] 2. It can inhibit the change of the curvature of the arc-shaped plate specimen during the stress process. A number of lateral threaded holes are provided on the two side support walls of the clamping body. Long bolts can be screwed into the lateral threaded holes. After the arc-shaped plate specimen is fixed and clamped, long bolts are selected to be screwed into appropriate lateral threaded holes, and after the two sides of the arc-shaped plate specimen are clamped, the long bolts are fixed with nuts, which can effectively control the curvature change of the arc-shaped plate specimen during the stress process. Moreover, the end of the long bolt in contact with the specimen is spherical, effectively avoiding damage to the surface of the specimen by the fixture.

[0018] 3. It can ensure that the force on the arc-shaped plate specimen is along the arc direction. When a fatigue test is carried out on the arc-shaped plate specimen on a material testing machine, the two sides of the arc-shaped plate specimen are clamped by long bolts, and the upper end of the arc-shaped plate specimen is clamped in the fixture device of the material testing machine in alignment along the arc direction. Applying force to the upper end of the arc-shaped plate can ensure that the force is along the arc direction of the arc-shaped plate.

[0019] 4. It is applicable to arc-shaped plate specimens with different thicknesses. When clamping the specimen, for specimens with different thicknesses, the distance between the two wedges can be adjusted by moving the support plate, so that the two wedges can firmly clamp the specimen.

[0020] 5. The structure of the present invention is simple, the installation is convenient, and the cost is low. It is convenient to clamp and disassemble the arc-shaped plate specimen, saving time and effort, and effectively improving the efficiency of mechanical experiments such as fatigue fracture. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a working schematic diagram of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the clamping body of the present invention.

[0023] Figure 3 For the present invention Figure 1 It is a schematic cross-sectional structure diagram at position A in the present invention.

[0024] Figure 4 It is a structural schematic diagram of the clamping table of the present invention.

[0025] Figure 5 It is a structural schematic diagram of the wedge block of the present invention.

[0026] Figure 6 It is a structural schematic diagram of the slider of the present invention.

[0027] Figure 7 It is a structural schematic diagram of the positioning bolt of the present invention.

[0028] Figure 8 It is a structural schematic diagram of the long bolt of the present invention.

[0029] Figure 9This is a schematic structural diagram of the support plate of the present invention.

[0030] In the figure: 1 is an arc plate specimen, 2 is a clamping device of the testing machine, 3 is a fixture body, 4 is a clamping table, 5 is a wedge block, 6 is a support plate, 7 is a positioning bolt, 8 is a slider, 9 is a through hole, 10 is a horizontal guide rail, 11 is a lateral threaded hole, 12 is a long bolt, and 13 is a spring. Specific embodiments

[0031] The following further describes the specific embodiments of the present invention in detail in conjunction with the accompanying drawings and specific embodiments. The following embodiments or drawings are used to illustrate the present invention, but not to limit the scope of the present invention.

[0032] See Figures 1-9 , this example provides a flexible adjustable fixture for fatigue performance testing of an arc plate specimen. The fixture device is mainly divided into two parts: a fixture body 3 and a clamping table 4.

[0033] The fixture body 3 is composed of a horizontal base and two side support wall plates. A number of lateral threaded holes 11 are provided on the two side support wall plates of the fixture body, and the long bolts 12 are installed in the lateral threaded holes 11.

[0034] A horizontal guide rail 10 is provided on the horizontal base of the fixture body 3, and a slider 8 is provided on the horizontal guide rail. The slider 8 can slide in a certain direction along the horizontal guide rail 10.

[0035] Threaded holes are provided around the slider 8, and bolts and nuts are screwed into the threaded holes of the slider 8 so that it can be fixed in the horizontal guide rail 10.

[0036] A through hole 9 is opened in the middle of the slider 8, and the positioning bolt 7 is installed in the through hole 9 and can move up and down.

[0037] The clamping table 4 is fixedly connected to the positioning bolt 7, and a wedge block 5 and a support plate 6 are provided on the clamping table 4.

[0038] Combined with the accompanying drawings, the usage method of the present invention is as follows:

[0039] When clamping the specimen, first install the fixture body 3 at one end of the clamping device 2 of the material testing machine, then connect the clamping table 4 with the positioning bolt 7 on the slider 8 with bolts, and then move and rotate the position of the clamping table 4 so that the clamping cavity between the two wedge blocks 5 in the clamping table 4 is aligned with one end of the arc plate specimen 1. Then, turn the bolt on the support plate 6 in the clamping table 4 to make the support plate 6 drive the wedge block 5 to move upward together until the wedge block 5 can no longer move upward and stop, and fasten the support plate 6 to the clamping table 4 with double nuts, that is, ensure that the wedge block 5 clamps one end of the arc plate specimen 1.

[0040] Then move the slider 8 on the horizontal guide rail 10 and the rotary clamping table 4 to appropriate positions so that the clamping device 2 of the material testing machine can centeringly clamp the other end of the arc-shaped plate specimen 1. At this time, tighten the bolts and nuts between the slider 8 and the horizontal guide rail 10, the slider 8 and the positioning bolt 7, and the positioning bolt 7 and the clamping table 4, so that the slider 8, the positioning bolt 7, and the clamping table 4 are fastened at the current positions.

[0041] After the arc-shaped plate specimen 1 is completely fixed and clamped, screw the long bolt 12 into the lateral threaded holes 11 on the support wall plates on both sides of the fixture body 3 so that the long bolt 12 can tightly abut against the two surfaces of the arc-shaped plate specimen 1. Since the end of the long bolt 12 in contact with the specimen is spherical, it can effectively inhibit the change of the curvature of the arc-shaped plate specimen 1 when it is stressed, and can avoid damage to the surface of the arc-shaped plate specimen 1 by the long bolt 12.

[0042] The above are only the preferred embodiments of the present invention and do not limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flexible adjustable fixture for fatigue performance testing of an arc-shaped plate specimen, characterized in that, The fixture part includes a fixture body, a horizontal guide rail, a slider, a positioning bolt, a clamping table, a support plate, a long bolt, a lateral threaded hole, a wedge block, and bolts and nuts for fastening. The fixture body is composed of a horizontal base and two side support wall plates. A number of threaded holes are provided on the two side support wall plates of the fixture body, and the long bolts are installed in the threaded holes. A horizontal guide rail is provided on the horizontal base of the fixture body, and a slider is provided on the horizontal guide rail. A through hole is formed in the middle of the slider, and the positioning bolt is installed in the through hole and can move up and down. The positioning bolt is connected to the clamping table by a bolt. After the positions of the positioning bolt and the clamping table are determined, the positioning bolt and the clamping table are fastened with double nuts. A wedge block and a support plate are provided on the clamping table. A groove is provided on the clamping table, and the wedge block is installed in the groove. The number of wedge blocks is two, and the wedge blocks are fixed on the clamping table with anti-drop springs. The space between the two wedge blocks is a clamping cavity. Threaded holes are provided on the bottom surface of the clamping table, and the support plate is installed on the bottom surface of the clamping table. Bolts matching the threaded holes are provided on the support plate, and the support plate is fastened on the clamping table with nuts.

2. The flexible adjustable fixture for fatigue performance testing of an arc-shaped plate specimen according to claim 1, wherein A slider is provided on the horizontal guide rail. The slider is a cube slider, and the width of the slider is consistent with the width of the horizontal guide rail.

3. The flexible adjustable fixture for fatigue performance testing of an arc-shaped plate specimen according to claim 1, wherein, Threaded holes are symmetrically provided around the slider. Bolts and nuts are screwed into the threaded holes to fasten the slider on the horizontal guide rail. A through hole is provided at the center of the slider, and the diameter of the through hole is slightly larger than the diameter of the positioning bolt. The positioning bolt is fastened on the slider with a nut.

4. A flexible adjustable fixture for fatigue performance testing of an arc-shaped plate specimen according to claim 1, wherein, One end of the long bolt is spherical.

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